BACKGROUND: 

Babasaheb Dr. B. R. Ambedkar  prescribed these vows so that:

1. There may be complete severance of bond with the old Hindu customs that promote superstition and caste which in turn hinders fraternity, human progress and scientific temper

2. To protect Buddhism from unnecessary confusion, contradictions and adulteration

These vows were administered by Babasaheb Dr Bhimrao Ambedkar after the official conversion ceremony on 14th October 1956 and then again on15th October 1956 in Marathi

(REFERENCE: Ambedkar Speaks, Volume 2 edited by Narendra Jadhav)